To better assist you, we will need more details. Is it for a NETFILE return? Is it a private health plan from an employer, and shows on a T4?

Are you using TurboTax Online or Desktop?

Thank you for choosing TurboTax.

private health plan. 

using turbo tax on my laptop

@christine-shallow If the amount for the private health care plan is from a T4 slip, you'll have to go back to that slip to edit the amount. You can search for T4.

If you entered the amount in the Medical expenses section, then you can go back there to make any changes. You can search for Medical.